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作 者:朱娟娟[1] 王伟[1] 林民东[1] 刘文庆[1] 王均安[1] 周邦新[1]
出 处:《上海大学学报(自然科学版)》2008年第5期525-530,共6页Journal of Shanghai University:Natural Science Edition
基 金:国家重点基础研究发展规划(973计划)基金资助项目(2006CB605003)
摘 要:用三维原子探针(3DAP)和热时效处理方法研究压力容器模拟钢中富铜原子团簇的析出过程.提高了Cu含量的压力容器模拟钢样品经过880℃加热淬火后,在400和500℃进行了不同时间的时效处理,显微硬度测试结果表明,在400和500℃时效的过程中硬度峰值分别出现在100和5 h.3DAP分析结果显示,样品在400℃分别时效100,150和300 h后,富铜原子团簇的数量密度是递增的,从1.5×1023m-3增加到6.2×1023m-3,但富铜原子团簇的长大非常缓慢,团簇的最大等效直径只从2 nm增大到了3.5 nm,团簇中的Cu原子数分数x为20%,还含有Mn和N i,并且观察到Mn和N i在团簇和基体金属的界面处发生明显的富集.Three-dimensional atom probe (3DAP) and thermal aged method were used to characterize precipitation of Cu-rich clusters in pressure vessel model steel. Pressure vessel model steel specimens were quenched at 880 ℃, then aged at 400 ℃ and 500 ℃ for different time. The results of hardness test show that peak hardness reached for 100 h aged at 400 ℃ and 5 h aged at 500 ℃, respectively. Analysis results of 3DAP indicate that the number density of Cu-rich clusters increases from 1.5 ×10^23m^-3 to 6.2 ×10^23m^-3, and equivalent diameter of the biggest clusters increases from 2 nm to 3.5 nm after aging 100 h and 300 h at 400℃. It shows that the growth of Cu-rieh clusters is very slow. The content of Cu in Cu-rich clusters is about 20%. Both Mn and Ni atoms are also segregated in Cu-rich clusters and distribution riehed at the α-Fe matrix/clusters interfaces.
关 键 词:压力容器钢 富铜原子团簇 三维原子探针(3DAP) 热处理
分 类 号:TG142.1[一般工业技术—材料科学与工程]
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